JPH0523595A - Nitrogen oxide decomposing catalyst and prodction thereof - Google Patents
Nitrogen oxide decomposing catalyst and prodction thereofInfo
- Publication number
- JPH0523595A JPH0523595A JP3182567A JP18256791A JPH0523595A JP H0523595 A JPH0523595 A JP H0523595A JP 3182567 A JP3182567 A JP 3182567A JP 18256791 A JP18256791 A JP 18256791A JP H0523595 A JPH0523595 A JP H0523595A
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- Japan
- Prior art keywords
- gel
- organic solvent
- nitrogen oxide
- ceramic composition
- transition metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は窒素酸化物、即ちＮＯX
を少量で非常に効果的に除去しえる窒素酸化物分解触媒
及びその製造方法に関するものである。This invention relates to nitrogen oxides, namely NO x.
The present invention relates to a nitrogen oxide decomposition catalyst capable of removing nitrogen in a very small amount and a method for producing the same.
【０００２】[0002]
【従来の技術】ＮＯX は、人間の呼吸器や神経に障害を
与える有害な物質であり、また、最近では酸性雨の一因
とされており、ＮＯX による大気汚染を防止することは
世界的な課題となっている。BACKGROUND OF THE INVENTION NO X is a harmful substance damaging to the human respiratory and nervous, also, in recent years has been a cause of acid rain, possible to prevent air pollution caused by NO X is the world Has become a problem.
【０００３】そこで、ＮＯX の環境への放出を抑制すべ
く従来から種々のＮＯX 除去方法が自動車、船舶等の移
動発生源、工場等の固定発生源において試みられてい
る。ＮＯX 処理技術は大別すると湿式法と乾式法に分け
られるが、今日実用化されているのは、乾式法の中の接
触還元法である。Therefore, in order to suppress the release of NO X to the environment, various NO X removal methods have been conventionally tried in mobile sources such as automobiles and ships, and fixed sources such as factories. The NO x treatment technology can be roughly classified into a wet method and a dry method, but the catalytic reduction method in the dry methods is practically used today.
【０００４】この接触還元法は選択法と非選択法に区分
されるが、選択法としては、例えば、ＮＨ3 を還元剤と
してＮＯを触媒下に還元する方法が行われている。この
ような触媒として、ＴｉＯ2 −Ｖ2 Ｏ5 −Ｗ（Ｍｏ）Ｏ
3 系触媒が実用化され、使用されてきた。しかし、使用
温度が約４００℃以上と高温であり、エンルギー負荷が
大きいという問題があり、また、自動車などの移動する
窒素酸化物発生源に対しては安全、制御上適さないなど
の問題点もあり、より低温で働く、また移動発生源に適
した触媒の開発が望まれている。This catalytic reduction method is classified into a selective method and a non-selective method. As the selective method, for example, a method of reducing NO with a reducing agent of NH 3 under a catalyst is performed. As such a catalyst, TiO 2 —V 2 O 5 —W (Mo) O
Three- system catalysts have been commercialized and used. However, there is a problem that the operating temperature is as high as about 400 ° C. or higher, the energetic load is large, and it is not suitable for moving nitrogen oxide sources such as automobiles in terms of safety and control. Therefore, it is desired to develop a catalyst that works at a lower temperature and is suitable for a mobile generation source.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、窒素
酸化物をより低温で少量で効率良く除去することのでき
る窒素酸化物分解触媒およびその製造方法を提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a nitrogen oxide decomposing catalyst capable of efficiently removing nitrogen oxides at a lower temperature in a small amount, and a method for producing the same.
【０００６】[0006]
【課題を解決するための手段】本発明は、金属化合物を
含むセラミック組成物にセラミック組成物に対し１種以
上の遷移金属化合物を０．１〜３０ｍｏｌ％添加した混
合物を湿潤な前駆体ゲルとし、該ゲルの気孔中にある有
機系溶媒を抜き取り、多孔体ゲルとしたことを特徴とす
る窒素酸化物分解触媒であり、かつ本発明は該有機系溶
媒のゲル気孔中からの抽出を有機系溶媒を超臨界流体と
して行うことにより製造でき、これにより上記課題を解
決できる。According to the present invention, a mixture of a ceramic composition containing a metal compound and 0.1 to 30 mol% of one or more transition metal compounds added to the ceramic composition is used as a wet precursor gel. The present invention is a nitrogen oxide decomposition catalyst characterized by extracting an organic solvent present in the pores of the gel to form a porous gel, and the present invention is an organic solvent extraction from the gel pores of the organic solvent. It can be produced by using a solvent as a supercritical fluid, which can solve the above problems.
【０００７】また、該有機系溶媒の抽出は、ＣＯ2 −該
有機系溶媒混合系の超臨界条件下でＣＯ2 により抽出除
去することが好ましい。本発明の窒素酸化物分解触媒
は、セラミック組成物に所定量の遷移金属化合物を混合
して湿潤な前駆体ゲルとし、生成もしくは反応系に予め
添加した有機系溶媒を除去することにより、セラミック
組成物から生成される多孔体、即ちエアロゲル表面に遷
移金属化合物を均一に分散、担持させたことを特徴とす
るものである。[0007] The extraction of the organic solvent is, CO 2 - it is preferred to extract and remove the CO 2 under supercritical conditions of the organic solvent mixed system. The nitrogen oxide decomposition catalyst of the present invention is a ceramic composition obtained by mixing a ceramic composition with a predetermined amount of a transition metal compound to form a wet precursor gel, and removing the organic solvent previously added to the production or reaction system. The present invention is characterized in that a transition metal compound is uniformly dispersed and supported on the surface of a porous body produced from a substance, that is, an airgel.
【０００８】本発明において、前駆体ゲルから多孔体ゲ
ルを得るための該有機系溶媒を前駆体ゲルから除去する
方法は特に制限はないが、好ましくは該有機系溶媒を超
臨界流体として抽出除去することにより、目的の多孔体
ゲルを良好に得ることができる。In the present invention, the method for removing the organic solvent from the precursor gel to obtain the porous gel from the precursor gel is not particularly limited, but the organic solvent is preferably extracted and removed as a supercritical fluid. By doing so, the desired porous gel can be satisfactorily obtained.
【０００９】ここで超臨界流体とは、有機系溶媒自体に
よるものでも任意に付加した物質との混合系でもよく、
例えば、湿潤ゲル中の有機系溶媒をゲルから抽出するた
めに使用する抽出溶媒との混合系が好ましい。該抽出溶
媒は、常温、常圧で液体である必要はなく、固有の臨界
温度および臨界圧力を有し、臨界条件下およびそれ以上
の超臨界条件下に機能する流体になり得るものならば、
如何なるものであってもよい。抽出溶剤は、単体であっ
ても複数組み合わせた混合物であってもかまわない。Here, the supercritical fluid may be either an organic solvent itself or a mixed system with a substance optionally added,
For example, a mixed system with an extraction solvent used for extracting the organic solvent in the wet gel from the gel is preferable. The extraction solvent does not have to be a liquid at room temperature and pressure, has an inherent critical temperature and critical pressure, and can be a fluid that functions under critical conditions and higher supercritical conditions,
It may be anything. The extraction solvent may be a single substance or a mixture of a plurality of extraction solvents.
【００１０】特に、有機系溶媒を超臨界流体として抽出
する場合の系としては、抽出溶媒としてＣＯ2 を使用し
たＣＯ2 −有機系溶媒混合系のが例示でき、この系の超
臨界条件において有機系溶媒をＣＯ2 により抽出除去す
ることが特に好ましい。Particularly, as a system for extracting an organic solvent as a supercritical fluid, a CO 2 -organic solvent mixed system using CO 2 as an extraction solvent can be exemplified. It is particularly preferable to extract and remove the system solvent with CO 2 .
【００１１】また、抽出溶剤−有機系溶媒混合系として
は、ＣＯ2 −アルコール系が好ましく、例えば、ＣＯ2
−メタノール系である場合は、温度８０℃、圧力１６０
ｋｇｆ／ｃｍ2 の条件が挙げられる。The extraction solvent-organic solvent mixture system is preferably a CO 2 -alcohol system, for example, CO 2
-When using a methanol system, the temperature is 80 ° C and the pressure is 160.
The conditions include kgf / cm 2 .
【００１２】本発明において、ＣＯ2 を抽出溶媒として
使用する方法において、好適な湿潤ゲルの乾燥方法を例
示すると以下の方法が挙げられる。セラミック組成物か
ら湿潤ゲルを生成し、有機系溶媒を含むゲルをＣＯ2 で
加圧、加温し、次いでこれらＣＯ2 ＋有機系溶媒混合系
を超臨界流体としてＣＯ2 を加えつつＣＯ2 および有機
系溶媒を系外に除去して容器内の超臨界流体が殆どＣＯ
2 になるまで有機系溶媒の除去を続け、その後減圧、降
温して乾燥した多孔体ゲルを得る方法である。In the present invention, the following method is mentioned as an example of a suitable method for drying a wet gel in the method of using CO 2 as an extraction solvent. Generates a wet gel from the ceramic composition, the gel comprising an organic solvent under pressure with CO 2, heated, then CO 2, and while the CO 2 adding these CO 2 + organic solvent mixture system as the supercritical fluid Most of the supercritical fluid in the container is CO
This is a method in which the removal of the organic solvent is continued until it becomes 2 , and then the pressure is reduced and the temperature is reduced to obtain a dried porous gel.
【００１３】本発明においては、上記条件にて湿潤ゲル
中の有機系溶媒の９０％以上を抜き取ることにより乾燥
された多孔体ゲルを調製するが、これは、その後の温
度、圧力の変動に対してもゲルの損傷、構造変化、多成
分ゲルの不均一化等を防止する効果を有する。逆に、ゲ
ルが有機系溶媒に浸っている間は、湿潤ゲルの損傷等に
は温度、圧力が大きく影響するため、ゲルの種類等に応
じて、適宜最適な条件を選定することが好ましい。In the present invention, a dried porous gel is prepared by extracting 90% or more of the organic solvent in the wet gel under the above-mentioned conditions. Even so, it has the effect of preventing damage to the gel, structural change, and non-uniformity of the multi-component gel. On the contrary, while the gel is immersed in the organic solvent, temperature and pressure have a great influence on the damage of the wet gel. Therefore, it is preferable to appropriately select the optimum conditions depending on the type of gel.
【００１４】本発明の窒素酸化物分解触媒は、該多孔体
ゲルのまま使用できるものであるが、所望により任意の
処理を加えたものでもよい。特に好ましい後処理は、多
孔体ゲルを５００℃で加熱処理することが挙げられる。The nitrogen oxide decomposing catalyst of the present invention can be used as it is as the porous gel, but may be optionally treated if desired. A particularly preferable post-treatment includes heating the porous gel at 500 ° C.
【００１５】本発明における窒素酸化物分解触媒の比表
面積は、７００ｍ2 ／ｇ以上、好ましくは８００ｍ2 ／
ｇ以上である。本発明に使用するセラミック組成物は、
多孔体ゲルを構成する基本的な金属元素を含むものであ
る金属元素化合物からなる。該金属元素化合物として
は、湿潤ゲルを生成するための任意の物質が包含され、
例示すれば、加水分解性金属アルコキシドあるいはその
加水分解生成オリゴマーが挙げられる。例えば、Ｓｉ
（ＯＲ）4 、Ａｌ（ＯＲ）3 、Ｔｉ（ＯＲ）4 、Ｚｒ
（ＯＲ）4 、ＰＯ（ＯＲ）3 、ＮａＯＲ、Ｍｇ（ＯＲ）
2 、ＫＯＲ、Ｃａ（ＯＲ）2 、Ｓｒ（ＯＲ）2 、Ｂａ
（ＯＲ）2 等（Ｒはメチル、エチル等のアルキル基) 、
金属塩等の無機化合物（例えば、ＮａＣｌ、ＭｇＢ
ｒ2 、ＴｉＣｌ4 等のハロゲン化物、ＮａＮＯ3 、Ｋ2
ＳＯ4 、Ｃａ（ＮＯ3 ）2 等の硝酸塩、硫酸塩等）、ア
ルコキシド以外の有機金属化合物（例えば、ＣＨ3 ＣＯ
ＯＮａ、（ＣＨ3 ＣＯＯ）2 Ｃａ等の酢酸塩、（ＣＯＯ
Ｎａ）2 、（ＣＯＯＫ）2 等のシュウ酸塩、ＥＤＴＡ、
ＮＴＡ等のキレート化合物との錯体等）、場合によって
は反応性のよい金属並びに酸化物微粉末（例えば、Ｃａ
Ｏ、ＴｉＯ2 、ＳｉＯ2 、Ｐ2 Ｏ5 、ＺｒＯ2 等）等を
併用することができる。[0015] The specific surface area of nitrogen oxide decomposing catalyst in the present invention, 700 meters 2 / g or more, preferably 800 m 2 /
g or more. The ceramic composition used in the present invention is
It is composed of a metal element compound containing a basic metal element that constitutes the porous gel. The metal element compound includes any substance for forming a wet gel,
For example, a hydrolyzable metal alkoxide or a hydrolyzed oligomer thereof can be mentioned. For example, Si
(OR) 4 , Al (OR) 3 , Ti (OR) 4 , Zr
(OR) 4 , PO (OR) 3 , NaOR, Mg (OR)
2 , KOR, Ca (OR) 2 , Sr (OR) 2 , Ba
(OR) 2 and the like (R is an alkyl group such as methyl and ethyl),
Inorganic compounds such as metal salts (eg NaCl, MgB
R 2 , halides such as TiCl 4 , NaNO 3 , K 2
SO 4 , Ca (NO 3 ) 2 and other nitrates, sulfates, etc., and organometallic compounds other than alkoxides (eg CH 3 CO 2
ONa, acetates such as (CH 3 COO) 2 Ca, (COO
Oxalates such as Na) 2 and (COOK) 2 , EDTA,
Complexes with chelate compounds such as NTA), and in some cases finely reactive metals and oxide fine powders (eg Ca
O, TiO 2 , SiO 2 , P 2 O 5 , ZrO 2, etc.) can be used together.
【００１６】本発明に使用される遷移金属化合物として
は、多孔体ゲル表面に固定化され、かつ触媒活性を有し
ているものであるならば特に制限されない。また、この
場合多孔体ゲルでの固定化における遷移金属化合物の構
造は特に制限なく、少なくとも触媒活性を有した構造で
あればよく、少なくとも金属部分を有していればよい
が、好ましくはクラスターの構造形態がよい。また、前
記構造と担体となるゲル原子との結合形態は共有結合、
イオン結合等の化学結合でも物理的結合でもよい。The transition metal compound used in the present invention is not particularly limited as long as it is immobilized on the surface of the porous gel and has catalytic activity. Further, in this case, the structure of the transition metal compound in the immobilization with the porous gel is not particularly limited as long as it has a structure having at least catalytic activity, and may have at least a metal portion, but preferably a cluster Good structural form. Further, the bond form between the structure and the gel atom serving as a carrier is a covalent bond,
It may be a chemical bond such as an ionic bond or a physical bond.
【００１７】このような遷移金属化合物の例としては、
好ましくはＩｂ族、ＶＩａ族、ＶＩＩＩ族、Ｖａ族、Ｖ
ＩＩａ族のものが挙げられ、例えば、酢酸コバルト、酢
酸銅、蓚酸クロム、臭化クロム、塩化コバルト、硝酸コ
バルト、塩化クロム、塩化銅、臭化銅等が挙げられる。Examples of such transition metal compounds include:
Preferably, Ib group, VIa group, VIII group, Va group, V
Examples of the group IIa include cobalt acetate, copper acetate, chromium oxalate, chromium bromide, cobalt chloride, cobalt nitrate, chromium chloride, copper chloride, and copper bromide.
【００１８】該遷移金属化合物は、前駆体ゲル生成のた
めにセラミック組成物に対し、０．１〜３０ｍｏｌ％、
好ましくは０．１〜５ｍｏｌ％の範囲で添加される。本
発明の窒素酸化物分解触媒の好ましい製造法を例示する
と下記が挙げられる。The transition metal compound is used in an amount of 0.1 to 30 mol% based on the ceramic composition to form a precursor gel.
Preferably it is added in the range of 0.1 to 5 mol%. Examples of the preferred method for producing the nitrogen oxide decomposition catalyst of the present invention include the following.
【００１９】金属アルコキシドに対し、有機溶媒を加
え、次に有機溶媒で希釈した水を加えて加水分解を行い
ゾルを生成させる。このゾルに触媒となる遷移金属化合
物を添加し、均一に混合する。このゾルをゲル化させた
湿潤な前駆体ゲルを超臨界条件下で溶媒を好ましくは、
ＣＯ2 で有機系溶媒を抽出することにより、遷移金属化
合物をシリカ担体上に非常に均一に高分散で担持した窒
素酸化物分解触媒を得る。An organic solvent is added to the metal alkoxide, and then water diluted with the organic solvent is added to cause hydrolysis to form a sol. A transition metal compound serving as a catalyst is added to this sol and mixed uniformly. This wet sol is a gelled wet precursor gel under supercritical conditions, preferably a solvent,
By extracting the organic solvent with CO 2 , a nitrogen oxide decomposition catalyst in which the transition metal compound is supported on the silica carrier very uniformly and in high dispersion is obtained.
【００２０】通常、合成された湿潤ゲルの気孔中に存在
する有機系溶媒は、セラミック組成物、遷移金属化合物
を溶解、混合するために用いた水系及び有機系溶媒の
他、他の任意の添加物およびこれらセラミック組成物、
遷移金属化合物の反応生成物、例えば、金属アルコキシ
ドを用いた場合、その加水分解、縮重合反応により生成
したアルコール、水等により満たされている。Usually, the organic solvent present in the pores of the synthesized wet gel includes the ceramic composition, the aqueous solvent and organic solvent used for dissolving and mixing the transition metal compound, and other optional additions. Objects and these ceramic compositions,
When a reaction product of a transition metal compound, for example, a metal alkoxide is used, it is filled with alcohol, water and the like produced by hydrolysis and polycondensation reaction thereof.
【００２１】従って、これら有機系溶媒を超臨界流体と
して除去する場合は、その条件設定を容易に制御できる
ことが望ましく、その手段として湿潤ゲルの生成条件を
事前に検討して有機系溶媒の組成を予測すること、形成
した湿潤ゲルを所望の有機系溶媒に浸して湿潤ゲル内の
有機系溶媒をその有機系溶媒と置換すること等が挙げら
れる。Therefore, when these organic solvents are removed as a supercritical fluid, it is desirable to be able to easily control the condition setting, and as a means therefor, the conditions for forming the wet gel are studied in advance to determine the composition of the organic solvent. Prediction, dipping the formed wet gel in a desired organic solvent, and substituting the organic solvent in the wet gel with the organic solvent, and the like.
【００２２】また、前記金属アルコキシドは、任意の改
質剤と反応させて使用することができ、例えば、活性水
素を有する有機化合物と反応させて加水分解の制御、即
ち湿潤ゲルの調整を行うことができる。このような有機
化合物としては、アルカノールアミン、例えば、モノエ
タノールアミン、モノｎ−プロパノ−ルアミン、モノis
o −プロパノ−ルアミン、ジエタノールアミン、ジiso
−プロパノ−ルアミン、トリエタノールアミン、トリis
o −プロパノ−ルアミンなど、βケト酸エステル、例え
ば、アセト酢酸エチル、アセト酢酸メチル、マロン酸エ
チル、マロン酸ジエチルなど、βジケトン化合物、例え
ば、アセチルアセトン等が挙げられる。The metal alkoxide can be used by reacting it with an arbitrary modifier, for example, reacting with an organic compound having active hydrogen to control hydrolysis, that is, to adjust wet gel. You can Such organic compounds include alkanolamines such as monoethanolamine, mono-n-propanolamine, mono-is
o-Propanolamine, diethanolamine, diiso
-Propanolamine, triethanolamine, tri-is
Examples include β-keto acid esters such as o-propanolamine, such as ethyl acetoacetate, methyl acetoacetate, ethyl malonate and diethyl malonate, and β-diketone compounds such as acetylacetone.
【００２３】該セラミック組成物は、必要に応じて、塩
基触媒、例えば、アンモニア、ピリジン、ピペリジン、
ピペラジンの存在下に加水分解することができる。加水
分解に必要な水の量は、適宜金属アルコキシド等のセラ
ミック組成物の組成に応じて適宜設定すればよい。The ceramic composition optionally contains a base catalyst such as ammonia, pyridine, piperidine,
It can be hydrolyzed in the presence of piperazine. The amount of water necessary for hydrolysis may be set appropriately according to the composition of the ceramic composition such as metal alkoxide.
【００２４】[0024]
実施例１
シリコンアルコキシド２４．４６ｇにメタノール４８．
０９ｇを混合し、これに水１４．４ｇをメタノール９
６．１９ｇで希釈した溶液を添加し、加水分解を行っ
た。これに酢酸コバルト１．２６８ｇを加え、均一に混
合した。このゾルを６０℃で保ってゲル化した後、７５
℃、１６０ｋｇ／ｃｍ2 の二酸化炭素の超臨界条件下で
溶媒を抽出除去した。この酢酸コバルトを担持したシリ
カを使い、ＮＯのＮ2 への分解テスト、即ちＮＯ転換率
を測定したところ、２５０℃で１０．５％のＮＯ転換
率、３００℃で３０．０％のＮＯ転換率を示した。（Ｎ
Ｏ ２５０ｐｐｍ、ＮＨ3 ２５０ｐｐｍ、流量１６０ｍ
ｌ／分、Ｗ／Ｆ（反応ガス１ｍｌ／分当たりの触媒量
（ｇ））＝６．３４×１０-4ｇ分／ｍｌ）
実施例２
シリコンアルコキシド２４．４６ｇにメタノール４８．
０９ｇを混合し、これに水１４．４ｇをメタノール９
６．１９ｇで希釈した溶液を添加し、加水分解を行っ
た。これに酢酸銅０．９４４ｇを加え、均一に混合し
た。このゾルを６０℃で保ってゲル化した後、７５℃、
１６０ｋｇ／ｃｍ2 の二酸化炭素の超臨界条件下で溶媒
を抽出除去した。この酢酸銅を担持したシリカを使い、
ＮＯの分解テストをしたところ、２５０℃で５１．８％
のＮＯ転換率、３００℃で６０．０％のＮＯ転換率を示
した（ＮＯ ２５０ｐｐｍ、ＮＨ3 ２５０ｐｐｍ、流量
１６０ｍｌ／分、Ｗ／Ｆ＝６．３４×１０-4ｇ分／ｍ
ｌ）。Example 1 To 24.46 g of silicon alkoxide was added 48.
09 g were mixed, and 14.4 g of water was added to methanol 9
A solution diluted with 6.19 g was added to carry out hydrolysis. To this, 1.268 g of cobalt acetate was added and mixed uniformly. After keeping this sol at 60 ° C for gelation,
The solvent was extracted and removed under supercritical conditions of carbon dioxide at 160 ° C. and 160 kg / cm 2 . Use of silica carrying the cobalt acetate, decomposition tests to N 2 NO, i.e. was measured NO conversion rate, 10.5% of the NO conversion at 250 ° C., 30.0% of the NO conversion at 300 ° C. Showed the rate. (N
O 250ppm, NH 3 250ppm, flow rate 160m
l / min, W / F (catalyst amount (g) per 1 ml / min of reaction gas) = 6.34 × 10 −4 g min / ml) Example 2 24.46 g of silicon alkoxide and 48.
09 g were mixed, and 14.4 g of water was added to methanol 9
A solution diluted with 6.19 g was added to carry out hydrolysis. 0.944 g of copper acetate was added to this and mixed uniformly. After keeping this sol at 60 ° C for gelation,
The solvent was extracted and removed under the supercritical condition of 160 kg / cm 2 carbon dioxide. Using silica that supports this copper acetate,
When a NO decomposition test was performed, it was 51.8% at 250 ° C.
Showed NO conversion of 60.0% at 300 ° C. (NO 250 ppm, NH 3 250 ppm, flow rate 160 ml / min, W / F = 6.34 × 10 −4 g min / m
l).
【００２５】[0025]
【発明の効果】本発明は、セラミック組成物と遷移金属
化合物とから生成される湿潤ゲルの気孔内に存在する有
機系溶媒を抽出除去することにより、セラミック組成物
からなるエアロゲル担体に非常に均一に遷移金属化合物
を分散担持させることができ、低温度条件でＮＯのＮ2
への転換効率が優れた窒素酸化物分解触媒を容易に製造
することができるので、特に自動車等のＮＯX 移動発生
源に好適に利用され得るので非常に有用である。INDUSTRIAL APPLICABILITY According to the present invention, by extracting and removing the organic solvent present in the pores of the wet gel formed from the ceramic composition and the transition metal compound, the airgel carrier composed of the ceramic composition can be made very uniform. A transition metal compound can be dispersed and supported on the N 2
Since it is possible to easily produce a nitrogen oxide decomposition catalyst having excellent conversion efficiency to NOx, it is very useful because it can be suitably used especially for a NO x transfer generation source such as an automobile.
Claims (3)
ラミック組成物に対し１種以上の遷移金属化合物を０．
１〜３０ｍｏｌ％添加した混合物を湿潤な前駆体ゲルと
し、該ゲルの気孔中にある有機系溶媒を抜き取り、多孔
体ゲルとしたことを特徴とする窒素酸化物分解触媒。1. A ceramic composition containing a metal compound, wherein the ceramic composition comprises one or more transition metal compounds.
A catalyst for decomposing nitrogen oxides, wherein a mixture containing 1 to 30 mol% is used as a wet precursor gel, and an organic solvent in the pores of the gel is extracted to obtain a porous gel.
ラミック組成物に対し１種以上の遷移金属化合物を０．
１〜３０ｍｏｌ％添加した混合物を湿潤な前駆体ゲルと
し、該ゲルの気孔中にある有機系溶媒を超臨界流体を経
由して抜き取ることを特徴とする窒素酸化物分解触媒の
製造方法。2. A ceramic composition containing a metal compound containing one or more transition metal compounds in an amount of 0.
A method for producing a nitrogen oxide decomposition catalyst, characterized in that a mixture containing 1 to 30 mol% is used as a wet precursor gel, and an organic solvent in the pores of the gel is extracted via a supercritical fluid.
混合系の超臨界条件下でＣＯ2 により抽出除去すること
を特徴とする請求項２記載の窒素酸化物分解触媒の製造
方法。Manufacturing method of the organic solvent mixed system of nitrogen oxide decomposing catalyst according to claim 2, wherein the extract is removed by CO 2 under supercritical conditions - wherein said organic solvent CO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182567A JPH0747130B2 (en) | 1991-07-23 | 1991-07-23 | Method for producing nitrogen oxide decomposition catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3182567A JPH0747130B2 (en) | 1991-07-23 | 1991-07-23 | Method for producing nitrogen oxide decomposition catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0523595A true JPH0523595A (en) | 1993-02-02 |
| JPH0747130B2 JPH0747130B2 (en) | 1995-05-24 |
Family
ID=16120536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3182567A Expired - Lifetime JPH0747130B2 (en) | 1991-07-23 | 1991-07-23 | Method for producing nitrogen oxide decomposition catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0747130B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011104458A (en) * | 2009-11-12 | 2011-06-02 | Nippon Steel Corp | Method of preparing catalyst for synthesis of methanol and method of producing methanol |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4975464A (en) * | 1972-09-01 | 1974-07-22 | ||
| JPS5385790A (en) * | 1977-01-10 | 1978-07-28 | Tdk Corp | Waste gas treating catalyst |
| JPS6345621A (en) * | 1986-08-13 | 1988-02-26 | Canon Inc | Data processor |
| JPS6345620A (en) * | 1986-08-12 | 1988-02-26 | Mitsubishi Electric Corp | Computer |
| JPS6345623A (en) * | 1986-08-12 | 1988-02-26 | Canon Inc | Input/output device |
| JPS6345622A (en) * | 1986-08-13 | 1988-02-26 | Hitachi Ltd | Ultrasonic tablet |
-
1991
- 1991-07-23 JP JP3182567A patent/JPH0747130B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4975464A (en) * | 1972-09-01 | 1974-07-22 | ||
| JPS5385790A (en) * | 1977-01-10 | 1978-07-28 | Tdk Corp | Waste gas treating catalyst |
| JPS6345620A (en) * | 1986-08-12 | 1988-02-26 | Mitsubishi Electric Corp | Computer |
| JPS6345623A (en) * | 1986-08-12 | 1988-02-26 | Canon Inc | Input/output device |
| JPS6345621A (en) * | 1986-08-13 | 1988-02-26 | Canon Inc | Data processor |
| JPS6345622A (en) * | 1986-08-13 | 1988-02-26 | Hitachi Ltd | Ultrasonic tablet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011104458A (en) * | 2009-11-12 | 2011-06-02 | Nippon Steel Corp | Method of preparing catalyst for synthesis of methanol and method of producing methanol |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0747130B2 (en) | 1995-05-24 |
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